Kinetics of the Transient Optical Absorption
in Li₂B₄O₇ and LiB₃O₅ Lithium Borate Crystals

I. N. Ogorodnikov* and M. S. Kiseleva

Yeltsin Ural Federal University (Ural State Technical University–UPI), 19, Mira Street, Yekaterinburg, 620002 Russia

* e-mail: ogo@dpt.ustu.ru

Received October 4, 2011

Abstract—This paper reports on a study of the kinetics of electron tunneling transport between electron and
hole centers in Li₂B₄O₇ and LiB₃O₅ lithium borate crystals under the conditions where the mobility of one of
the partners in the recombination process is thermally stimulated. A mathematical model has been proposed to
describe all specific features in the relaxation kinetics of the induced optical density observed in Li₂B₄O₇ (LTB)
and LiB₃O₅ (LBO) nonlinear optical crystals within a broad time interval of 10^–8–1 s after a radiation pulse.
The results of calculations have been compared with experimental data on transient optical absorption (TOA)
of LTB and LBO crystals in the visible and ultraviolet spectral regions. The nature of the radiation defects
responsible for TOA and the dependence of the TOA decay kinetics on temperature, excitation power, and other
experimental conditions have been discussed.

DOI: 10.1134/S1063783412040191

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